Let both the series $a_{1}, a_{2}, a_{3}, \ldots$ and $b_{1}, b_{2}, b_{3} \ldots$ be in arithmetic progression such that the common differences of both the series are prime numbers. If $a_{5}=b_{9}, a_{19}=b_{19}$ and $b_{2}=0$, then $a_{11}$ equals
- $79$
- $83$
- $84$
- $86$